ISR Performance 350z VQ35DE primary o2 sensor Harness Extensions for 4 wire o2 sensor. This harness extension kit is constructed using OEM Housings, Locks, Wire Seals, and Terminals, as well as MIL Spec M22759/32 Tefzel wire. When installing long tube headers into your 350z you will need to extend the primary o2 sensor wires, with this kit you will no longer have to cut/splice your o2 sensor wires, this is a direct plug and play! ***PLEASE INSPECT YOUR HARNESS PRIOR TO ORDERING AND ENSURE YOU HAVE THE EARLY MODEL VQ35DE 4 WIRE O2 SENSORS IN PLACE, THIS WILL NOT WORK WITH LATER MODEL 6 WIRE O2 SENSORS!***

LEGAL IN CALIFORNIA ONLY FOR RACING VEHICLES WHICH MAY NEVER BE USED, OR REGISTERED OR LICENSED FOR USE, UPON A HIGHWAY